Segment Information - Additional Information (Detail)	12 Months Ended
	Sep. 26, 2014 Segment
Segment Reporting Information [Line Items]
Number of reportable segments	2
Number of businesses under other category	2
Geographic revenue from external customers	Japan represented approximately 13% of the Company’s total revenues in fiscal year 2014. No single foreign country represented 10% or more of the Company’s total revenues in fiscal years 2013 and 2012, respectively
Sales Revenue, Segment | Geographic Concentration Risk
Segment Reporting Information [Line Items]
Percentage of revenues in Japan of the total foreign revenues	13.00%